function deepClone(obj) {
  // Handle the 3 simple types, and null or undefined
  if (obj == null || typeof obj !== 'object') return obj
  // Handle Date
  if (obj instanceof Date) {
    var copy = new Date()
    copy.setTime(obj.getTime())
    return copy
  }
  // Handle Array
  if (obj instanceof Array) {
    var copy = []
    for (var i = 0,
      len = obj.length; i < len; ++i) {
      copy[i] = cloneStrong(obj[i])
    }
    return copy
  }
  // Handle Object
  if (obj instanceof Object) {
    var copy = {}
    for (var attr in obj) {
      if (obj.hasOwnProperty(attr)) copy[attr] = cloneStrong(obj[attr])
    }
    return copy
  }
  throw new Error("Unable to copy obj! Its type isn't supported.")
}